What material is the cup cover made of PP material?

1. The Pp at the bottom of the water cup represents polypropylene material, commonly found in microwave lunch boxes and plastic water cups.
2. The recycling marked with "5" indicates that its main manufacturing material is PP. Plastic containers made of this material have good breathability, high heat resistance, high impact resistance, strong mechanical properties, and resistance to various organic solvents and acid alkali corrosion. Used for plastic containers such as microwave lunch boxes and baby bottles. PP plastic containers are the only ones that can be heated in a microwave, and can be reused after careful cleaning. But some microwave lunch boxes are made of No. 5 PP, but the lid is made of No. 1 PE, so they cannot be put into the microwave together with the box.